On Friday 04 July 2014 09:30:02 Stuart Stevenson did opine And Gene did reply:
> I tend to use single flute router cutters for what you describe. > Reverse helix will cause the cutters to push the material down rather > than puck it up into the cutter and break it. Humm, The place where I've broken several of these SC mills, which are up spiral 2 fluter's, seems to be when plowing the 2 circles, one to make a center hole to make it fit the lathes spindle, and one for the outside edge to cut the whole thing out of the sheet. Going 1.5 thou deeper per pass, 2.5 IPM is about as fast as I dare move at this leisurely, 2500 revs, spindle speed. Going to down spiral, there's no place for the chip to go except up until it has holed thru, which it takes about 25 passes to do. I have considered doing a half a mill diameter offset on the scrap side and doing two passes at each depth, but I don't know as I could gain enough cutting speed to make up for doing each circle twice. I don't know as my mill supplier, Midwest Circuit Specialties, can even supply a straight flute or down spiral mill, and no single flute's that I know of. Run time for the whole thing is most of a day, about 400 minutes as it is. One code change that might help the finish, is the width of the slot is set by a duty-cycle variable. If I detect the last 2 passes where its already holed thru and add 1%, that might serve to smooth up the sidewalls of the slot. In fact, I think I'll add that to the code even before I make another disk. [...] Thanks Stuart. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS ------------------------------------------------------------------------------ Open source business process management suite built on Java and Eclipse Turn processes into business applications with Bonita BPM Community Edition Quickly connect people, data, and systems into organized workflows Winner of BOSSIE, CODIE, OW2 and Gartner awards http://p.sf.net/sfu/Bonitasoft _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
